Adjustable support for commutator-brushes.



P. VAN S. KOLFF.

ADJUSTABLE SUPPORT FOR COMMUTATOR BRUSHES.

APPUCATION FILED DEC. 10, ISIS- 1 ,270,957. Patented July 2, 1918.

PETRUS VAN SANTEN KOLFF, OF PHILADEL PI-IIA, PENNSYLVANIA, ASSIGNOR, BYMESNE ASSIGNMENT-S, TO THE ELECTRIC TACHOMETER CORPORATION, ACORPORATION OF DELAWARE.

ADJUSTABLE SUPPORT FOR COMMUTATOR-BRUSHES.

Specification of Letters Patent.

Patented July 2, 1918.

Application filed December 10, 1915. Serial No. 66,054.

To all whom it may concern Be it known that I, PETRUS VAN SANTEN KOLFF,a citizen of the United States, residing in the city of Philadelphia,county of Philadelphia, State of Pennsylvania, have invented certain newand useful Improvements in Adjustable Supports for Commu tator-Brushes,of which the following is a specification.

My invention has for its principal object to provide a support for acommutator brush whereby said brush may adjust and accommodate itself tothe commutator and so that the said brush may lie flat against the saidcommutator.

A further object is to provide a support whereby the brushes vmay beadjusted toward and from the commutator whereby the pressure of the sameagainst the commutator may be varied.

Other objects and advantages of my invention will be pointed out in thedescription which follows or will be apparent from such description.

In order that my invention may be more readily comprehended andunderstood reference should be had to the accompanying drawing in whichI have illustrated one form of a convenient embodiment thereof but itshould be understood that changes in the details of construction may bemade within the scope of the claims without departing from my saidinvention.

In the drawings Figure 1 is a front elevational view of a deviceembodying my invention, the commutator with which the brushes are shownin contact being shown in transverse section;

Fig. 2 is a central, vertical section taken on the line 22 of Fig. 1;

Fig. 3 is a vertical, sectional view taken on the line 33 of Fig. 1; and

Fig. a is a transverse sectional view taken on the line 1- 1 of Fig. 1.

Referring to the drawings, 1 designates the casing (of a magneto)consisting of brass or other suitable material within which thecommutator 2 and other parts are inclosed. The shaft of the commutatoris journaled at one end in a bearing 3 of brass secured in a side of thecasing 1. The opposite end of said shaft (not shown) is also suitablysupported in a bearing. The inner side of one side, wall of the casingis provided with an annular flange 5 surrounding the commutator shaftand a portion of the commutator structure on which is movably secured asupport 6. The said support 6 is adapted to be secured and held inposition by means of binding screws or bolts (not shown) which extendthrough arcuate slots 7 in the supporting member 6 and are connectedwith the adjacent side wall of the casing 1. At its upper or outer endthe support 6 is provided with bearings 8 of suitable insulatingmaterial in which is journaled the cylindrical ends 9 of studs or blocks10 provided with transverse openings 11 in which are rotatably securedholders 12 for holding the brushes 13, the upper ends of said brushesbeing secured in slots 13 in the holders. The said holders 12 areprovided with reduced cylindrical portions 14: which extend through theopenings'll in the studs or blocks 10. These holders are secured inplace by the nuts 15 secured upon the upper outer ends of the reducedcylindrical portions 14. The cylindrical reduced portions 14 are freelyrevoluble in the transverse openings 11 so that when the lower ends ofthe brushes 13 contact with the sides of the commutator 2 they mayautomatically ad just themselves to any slant or unevennesses of thesurface of such commutator.

Adjacent to its upper end and at its opposite edges the adjustablesupport (5 provided with lugs or projections 20 having adjusting screws21 in screw-threaded engagement therewith, such screws being adapted tobe locked in position by the binding nuts 22. The inner ends of the saidadjusting screws are provided with terminals 23 of insulating materialwhich contacts with the outer sides of the brush holders 12 as shownvery clearly in Fig. 1 of the drawings. By adjusting these adjustingscrews 21 inwardly or outwardly the distance between the contactportions of the brushes 13 may be varied.

It will be seen that the brushes not only have swinging movements aboutthe axes of the plugs or blocks 10 within the bearings 8 but that theyalso have an independent pivotal movement about the axis of the holders12 within the transverse openings 11.

In addition to the independent adjust ments of the brushes and theirimmediate holders and supports the support 6 is also adjustable aboutits support, so that both of the said brushes may be simultaneouslyadj'usre'd bodily With relation to the commutator.

I claim 1. In a commutator brush support, the combination of rotatableblocks having cylindrical portions and also having openings extendingtransversely thereof, the said blocks being arranged in parallelrelation to the commutator, bearings in which the said cylindricalportions are secured Whereby the said blocks are rotatably supported andcommutator brushes extending through the said openings and beingrotatably secured therein.

2. In a commutator brush support the combination of an uprightsupporting mem her having projections adjacent to its upper end at itsopposite edges, rotatable devices supported in said supporting memberintermediate said projections, said devices Gopies of this patent may beobtained for five dents each, by addressing the having transverseopenings extending therethrough, brush holders rotatably supported insaid openin s and adjusting devices suported in sai projeetions andcontacting With the outer sides of said brush holders to pivotallyadjust the same.

3. In a commutator brush support the combination of an adjustableupright sup porting member having projections adjacent to its upper endatits opposite edges, rotatable devices supported in openings adjacentto the upper end of said supporting memher said devices having openingsextending transversely therethrough, brush holders rotatably secured'and supported in said transverse openings, and adjustable devicessecured in said projections for contacting with the outer sides of saidbrush holders for adjusting the same.

In testimony that I claim the foregoing as my invention I have hereuntosigned my name this 8th day of December, A. D. 1915.

PETRUS VAN SANTEN KOLFF.

Commissioner of Patents,

Washington, D. G.

